EFS Backup

6th July, 2014

An open source android app to backup and restore the EFS partition of any device.

EFS is a system partition in the root directory of the phone that contains very important and basic information about the device's identity like Wi-Fi MAC address, Bluetooth MAC address and the MOST IMPORTANT - IMEI address (nv_data.bin).

Now if this EFS partition accidentally gets corrupted or erased, the phoneÃÂ¢ÃÂÃÂs IMEI number will get erased and the device will become completely useless. It won't be able to make voice call further, as the carrier network will not recognize the phone. This can happen for a variety of reasons, including flashing a wrong or corrupted ROM. This kind of damage is not accepted by the service center. Only solution that the service center provides is to replace the motherboard of the device and that costs a lot of $$$!

Only a backup of the EFS partition can save the phone if something goes wrong with the EFS partition.

Screenshots

How to Use?

To backup:

Tap to open the app from the launcher

Grant root permissions

Check the device details that are shown within the app

Tap to backup the EFS partition (requires root permission)

'efs*.img' backup img file will be created in the root directory of internal storage